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Published June 15, 2012 | Published
Journal Article Open

Thermoelectric properties of Zn_5Sb_4In_(2-δ)(δ=0.15)


The polymorphic intermetallic compound Zn_5Sb_4In_(2−δ) (δ = 0.15(3)) shows promising thermoelectric properties at low temperatures, approaching a figure of merit ZT of 0.3 at 300 K. However, thermopower and electrical resistivity changes discontinuously at around 220 K. Measurement of the specific heat locates the previously unknown temperature of the order-disorder phase transition at around 180 K. Investigation of the charge carrier concentration and mobility by Hall measurements and infrared reflection spectroscopy indicate a mixed conduction behavior and the activation of charge carriers at temperatures above 220 K. Zn_5Sb_4In_(2−δ) has a low thermal stability, and at temperatures above 470 K samples decompose into a mixture of Zn, InSb, and Zn_4Sb_3.

Additional Information

© 2012 American Institute of Physics. Received 24 April 2012; accepted 17 May 2012; published online 21 June 2012. This work was supported by the National Science Foundation through grant DMR-1007557.

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Published - Wu2012p18978J_Appl_Phys.pdf


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